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Title: WMAP dark matter constraints and Yukawa unification in supergravity models with CP phases

Abstract

The compatibility of producing the observed amount of dark matter, as indicated by the Wilkinson Microwave Anisotropy Probe (WMAP) data, through the relic abundance of neutralinos with Yukawa unification and with the measured rate of b{yields}s{gamma} is analyzed in mSUGRA and extended SUGRA unified models with the inclusion of CP phases. The CP phases affect the analysis in several ways, e.g., through the threshold corrections to the b-quark mass, via their effects on the neutralino relic density and through the supersymmetry (SUSY) contribution to the BR(b{yields}s{gamma}) which is sensitive to the CP phases. We present some specific models with large SUSY phases, which can accommodate the fermion electric dipole moment constraints and give a neutralino relic density in agreement with observations as well as with the b-{tau} unification constraint. The possibility of achieving WMAP relic density constraints with full Yukawa unification is also explored.

Authors:
 [1];  [2];  [2];  [3];  [4]
  1. Departamento de Fisica Aplicada, Facultad de Ciencias Experimentales, Universidad de Huelva, 21071 Huelva (Spain)
  2. Department of Physics, Northeastern University, Boston, Massachusetts 02115-5000 (United States)
  3. (Germany)
  4. Instituto de Fisica, Universidade de Sao Paulo, 05315-970 Sao Paulo, SP (Brazil)
Publication Date:
OSTI Identifier:
20713866
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. D, Particles Fields; Journal Volume: 72; Journal Issue: 9; Other Information: DOI: 10.1103/PhysRevD.72.095008; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ABUNDANCE; ANISOTROPY; B QUARKS; CORRECTIONS; CP INVARIANCE; DENSITY; ELECTRIC DIPOLE MOMENTS; NONLUMINOUS MATTER; PARTICLE DECAY; RELICT RADIATION; REST MASS; SPARTICLES; SUPERGRAVITY; SUPERSYMMETRY; UNIFIED MODEL

Citation Formats

Gomez, Mario E., Ibrahim, Tarek, Nath, Pran, Max Planck Institute for Physics, Fohringer Ring 6, D-80805, Munich, and Skadhauge, Solveig. WMAP dark matter constraints and Yukawa unification in supergravity models with CP phases. United States: N. p., 2005. Web. doi:10.1103/PhysRevD.72.095008.
Gomez, Mario E., Ibrahim, Tarek, Nath, Pran, Max Planck Institute for Physics, Fohringer Ring 6, D-80805, Munich, & Skadhauge, Solveig. WMAP dark matter constraints and Yukawa unification in supergravity models with CP phases. United States. doi:10.1103/PhysRevD.72.095008.
Gomez, Mario E., Ibrahim, Tarek, Nath, Pran, Max Planck Institute for Physics, Fohringer Ring 6, D-80805, Munich, and Skadhauge, Solveig. Tue . "WMAP dark matter constraints and Yukawa unification in supergravity models with CP phases". United States. doi:10.1103/PhysRevD.72.095008.
@article{osti_20713866,
title = {WMAP dark matter constraints and Yukawa unification in supergravity models with CP phases},
author = {Gomez, Mario E. and Ibrahim, Tarek and Nath, Pran and Max Planck Institute for Physics, Fohringer Ring 6, D-80805, Munich and Skadhauge, Solveig},
abstractNote = {The compatibility of producing the observed amount of dark matter, as indicated by the Wilkinson Microwave Anisotropy Probe (WMAP) data, through the relic abundance of neutralinos with Yukawa unification and with the measured rate of b{yields}s{gamma} is analyzed in mSUGRA and extended SUGRA unified models with the inclusion of CP phases. The CP phases affect the analysis in several ways, e.g., through the threshold corrections to the b-quark mass, via their effects on the neutralino relic density and through the supersymmetry (SUSY) contribution to the BR(b{yields}s{gamma}) which is sensitive to the CP phases. We present some specific models with large SUSY phases, which can accommodate the fermion electric dipole moment constraints and give a neutralino relic density in agreement with observations as well as with the b-{tau} unification constraint. The possibility of achieving WMAP relic density constraints with full Yukawa unification is also explored.},
doi = {10.1103/PhysRevD.72.095008},
journal = {Physical Review. D, Particles Fields},
number = 9,
volume = 72,
place = {United States},
year = {Tue Nov 01 00:00:00 EST 2005},
month = {Tue Nov 01 00:00:00 EST 2005}
}
  • We study the predictions of the simplest SU(5) grand unified model within the framework of minimal supergravity, including constraints from the radiative breaking of electroweak symmetry. As a consequence of the unification of the [ital b]-quark and [tau]-lepton Yukawa couplings, the top quark mass is predicted to be close to its fixed point value. We delineate the regions of the supergravity parameter space consistent with constraints from the nonobservation of proton decay and from the requirement that the lightest supersymmetric particle does not overclose the universe. These constraints lead to a definite pattern of sparticle masses: the feature unique tomore » Yukawa unified models is that some of the third generation squarks are much lighter than those of the first two generations. Despite the fact that all sparticle masses and mixings are determined by just four supersymmetry parameters at the grand unified theory scale (in addition to [ital m][sub [ital t]]), we find that the signals for sparticle production can vary substantially over the allowed parameter space. We identify six representative scenarios and study the signals from sparticle production at the CERN Large Hadron Collider. We find that by studying the signal in various channels, these scenarios may be distinguished from one another, and also from usually studied minimal models'' where squarks and sleptons are taken to be degenerate. In particular, our studies allow us to infer that some third generation squarks are lighter than other squarks---a feature that could provide the first direct evidence of supergravity grand unification.« less
  • We derive constraints on the parameter space of the unified model of dark energy and dark matter, the generalized Chaplygin gas, from the amplitudes and positions of the first few peaks and first trough of the cosmic microwave background radiation power spectrum, using the latest WMAP five-year data.
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  • We revisit the WMAP dark matter constraints on Yukawa Unification in the presence of massive neutrinos. The large neutrino mixing indicated by the data modifies the predictions for the bottom quark mass, and enables Yukawa also for large tan {beta}, and for positive {mu} that were previously disfavoured. As a result, the allowed parameter space for neutralino dark matter also increases, particularly for areas with resonant enhancement of the neutralino relic density. We also find that the parameter space that is compatible with dark matter, also predicts detectable rates for Lepton Flavour Violation.